Wszystkie pola: Liu, Liu - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Analysis of dynamic characteristics of an experimental bench of high-pressure water fracturing assisted cutting
Autorzy:: Liu, Zhiming
Zhang, Qiang
Sun, Yuliang
Liu, Junming
Powiązania:: https://bibliotekanauki.pl/articles/2200892.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: high-pressure water fracturing
experimental bench
dynamic characteristics
Opis:: Aiming at the problem that the cutting efficiency of a drum shearer is low when mining hard coal seams, an experimental bench of high-pressure water fracturing assisted cutting is designed. Compared with normal ones, the maximum equivalent stress of the improved experimental bench is reduced by 55.38%, and the maximum total deformation is reduced by 27.23%. According to the results of dynamic response analysis, it is concluded that the experimental bench of high-pressure water fracturing assisted cutting is stable and reliable under extreme working conditions, and meets design requirements for strength and stiffness.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 317--330
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Structural optimization on the design of an automobile engine intake pipe
Autorzy:: Xie, Jianxin
Liu, Zimeng
Powiązania:: https://bibliotekanauki.pl/articles/2104764.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: engine
intake pipe
Fluent
optimization design
Opis:: The engine intake pipe is an important part of the engine. A reasonable layout of the intake pipe can prolong service life of the engine and improve engine power. The optimization of design of the intake pipe has a great impact on the overall performance of the engine. The design of the intake pipe based on experience is subjective and unilateral, and the design cycle and experimental period are long. Ansys Fluent software is used to simulate the design, which can more intuitively reflect the air flow condition of the intake pipe and enable selection of the best layout. First of all, a three-dimensional model of the intake pipe is simulated and the airflow characteristics are studied and analyzed. The streamline diagram and velocity contour under various conditions are obtained. Then, compared with the simulation results, the position of the intake pipe is optimized. Finally, the optimized intake pipe is simulated and verified. According to the experimental results, the intake performance of the optimized intake pipe is greatly improved.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 3; 449--461
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: A control strategy of a permanent magnet synchronous motor for an electric vehicle
Autorzy:: Xie, Jianxin
Liu, Zimeng
Powiązania:: https://bibliotekanauki.pl/articles/2200826.pdf
Data publikacji:: 2022
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: PMSM
SVPWM method
argument
voltage difference
Opis:: The traditional modulation method of the inverter in a permanent magnet synchronous mo- tor (PMSM) is lengthy and computationally intensive. Based on this, a simplified sinusoidal pulse width modulation method is proposed. In this method, voltage space vectors in each sector are synthesized, and the sector in which the synthesized vector is located is determined by the rotation angle of the resultant vector, and then the acting time of the basic vector is calculated by the voltage difference of the phase voltage. The problem of trigonometric functions and coordinate conversion is not involved in the whole calculation process, the calculation model is simple, and it is easy to realize digitization. Mathematical modeling is carried out by using the simulation software Matlab, and the correctness of the calculation method after optimization is verified, which provides an idea for the later research of the inverter modulation method.
Źródło:: Journal of Theoretical and Applied Mechanics; 2022, 60, 4; 673--685
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Dynamic analysis of a mechatronic drive system with an induction motor
Autorzy:: Cao, Yongdi
Liu, Xiaohong
Powiązania:: https://bibliotekanauki.pl/articles/2200885.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: dynamic model
electromechanical system
vector control
optimization
rotor
Opis:: The paper presents research findings in the modelling and optimization of dynamic parameters of mechatronic systems with an induction motor. A mathematical model was developed to analyze currents in dynamic states of squirrel-cage rotors in the case of a line-to-line fault. The findings were verified experimentally using calculations for a 1.5 kW three-phase induction motor. The equations for a stationary 0x, 0y coordinate system relating to the stator were derived. The set of design variables selected in the optimization process contained parameters describing design features of the gear shafts and control units settings.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 245--258
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: A prediction method for load distribution in threaded connections
Autorzy:: Zhang, D.
Gao, S.
Niu, S.
Liu, H.
Powiązania:: https://bibliotekanauki.pl/articles/949123.pdf
Data publikacji:: 2018
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: load distribution
threaded connections
finite element analysis
Opis:: A new method has been developed for predicting the load distribution along the thread portion of a bolt and nut connection. The calculated results were validated by comparison with three-dimensional finite element analysis and Yamamoto’s method. It was shown that the load distribution predicted by the model in this paper was in good agreement with the results from finite element model, and the load ratio on the first thread by the prediction model and finite element model was slightly larger than the results from Yamamoto’s method. In addition, the results of calculation and finite element analysis indicated that the decreasing of the lead angle could improve the load distribution, the increasing of the length of thread engaged could significantly improve the load bearing capacity of the first thread, and the adopting of a material with low stiffness for the nut with respect to the bolt could improve the load distribution slightly.
Źródło:: Journal of Theoretical and Applied Mechanics; 2018, 56, 1; 157-168
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Analysis of vibration transfer characteristics of vehicle suspension system employing inerter
Autorzy:: Shen, Y.
Chen, L.
Liu, Y.
Zhang, X.
Powiązania:: https://bibliotekanauki.pl/articles/281766.pdf
Data publikacji:: 2017
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: vehicle
suspension
inerter
vibration analysis
Opis:: In this paper, the force transfer mechanism of three mechanical elements “inerter, spring and damper” is analyzed based on the “force-current” analogy theory. The vibration isolation performance of the two types of simple three-element vehicle suspensions S1 (inerter is in parallel with damper) and S2 (inerter is in series with damper) are studied. The dual-mass system model of the suspensions is built by means of using the mechanical impedance method. The influence of parameters variation on vibration transfer characteristics is also investigated.
Źródło:: Journal of Theoretical and Applied Mechanics; 2017, 55, 4; 1245-1256
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: On the yield surface of a typical bending-dominant periodic lattice metamaterial
Autorzy:: Wang, Yongjun
Liu, Jinxing
Powiązania:: https://bibliotekanauki.pl/articles/2200879.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: bending-dominant periodic lattice
BDPL
yield
metamaterial
strain energy equivalence
Opis:: A theoretical method for analyzing the initial yield of a typical bending-dominant peri- odic lattice (BDPL) is established. Based on the principle of strain energy equivalence, the macroscopic effective stiffnesses of lattices are calculated. An empirical formula is employed to consider the contributions of both the axial force and bending moment. The initial yield surface of BDPL can be figured out by comparing the effective stress of each strut to the yield strength of the matrix material. The method is applicable to various BDPLs, which we believe is a helpful extension to the method for lattices comprising axial-tension bars in the literature.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 1; 175--187
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Experimental study on amplitude-frequency characteristic and basin stability of horizontally driven pendulum
Autorzy:: Jia, J.
Wu, Y.
Liu, W.
Xiao, J.
Powiązania:: https://bibliotekanauki.pl/articles/281610.pdf
Data publikacji:: 2016
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: horizontally driven pendulum system
bifurcation
basin stability
Opis:: In this article, an inverted pendulum system is set up to explore the dynamics of a horizontally driven pendulum which exhibits a great variety of dynamical behavior and appears in a wide range of applications in the field of engineering. The facility is efficient to experimentally explore two kinds of coexisting movement patterns in the horizontally driven pendulum, i.e. in-phase and anti-phase patterns between the angular velocity of the pendulum rod and the direction of the driving forces. Theoretical analysis is applied to reveal the regimes of the coexistence of the two movement patterns, which is promising to control the system to a desired pattern.
Źródło:: Journal of Theoretical and Applied Mechanics; 2016, 54, 3; 839-846
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Establishment of constitutive model and dynamic parameter analysis of rubber conveyor belt
Autorzy:: Chen, Hongyue
Liu, Siyuan
Powiązania:: https://bibliotekanauki.pl/articles/2200896.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: rubber conveyor belt
wire rope core
kinetic parameters
fitting curve
mathematical model
Opis:: A rubber conveyor belt is an essential piece of equipment in coal mine transportation. Its current motion and performance are directly affected by dynamic parameters. In this paper, a constitutive model has been established to study a rubber conveyor belt in order to analyze its dynamic characteristics. The covered rubber was considered as a classical solid model. The wire rope core was used as a Kelvin model, and a generalized constitutive mathematical model was established. Using Matlab, compariso of the fitting curve and the experimental curve was carried out to ensure reliability in an appropriate way. Meanwhile, the influence of different factors on dynamic parameters of rubber conveyor belts was also discussed by controlling the loading frequency and amplitude as well as external temperature. Finally, the experiment with the fitting curve was compared and verified, and the research results can provide a reference for this engineering field.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 365--378
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: Influence of pre-tension on torsion of microscale Cu wires: a study via strain gradient theory
Autorzy:: Ma, Xinbing
Liu, Jinxing
Powiązania:: https://bibliotekanauki.pl/articles/280360.pdf
Data publikacji:: 2019
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: nonproportional loading
strain gradient plasticity
size effect
cyclic response
Opis:: Nonproportional plastic deformations on the microscale are an emerging topic. A simplified theory of strain gradient elasto-plasticity is developed to study the evolution of yield strength in a copper wire sequentially experiencing tension and torsion. The pre-tension deformation and stress are inherited to the upcoming torsion process, resulting in a nonproportional loading condition. With consideration of the extra hardening effect due to strain gradient, pre-tension weakens the extra hardening effect of the strain gradient and the dependence on the wire radius. Cyclic torsion behavior is also investigated. Anomalous Bauschinger effect and plastic softening are found.
Źródło:: Journal of Theoretical and Applied Mechanics; 2019, 57, 4; 1055-1065
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 11.

Tytuł:: Numerical investigation of the inner flow in a centrifugal pump at the shut-off condition
Autorzy:: Liu, H.
Wu, X
Tan, M.
Powiązania:: https://bibliotekanauki.pl/articles/281524.pdf
Data publikacji:: 2013
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: centrifugal pump
numerical simulation
shut-off condition
PIV
Opis:: The unsteady flow fields in a centrifugal pump at the shut-off condition (SOC) are simulated by the Unsteady Reynolds Averaged Navier-Stokes (URANS) approach. To improve simulation accuracy and assign the boundary condition, special 3D models are made. Three-dimensional URANS equations are solved on high-quality unstructured grids with the shear stress transport turbulence model by using the computational fluid dynamics (CFD) code CFX-11.0. Furthermore, the numerical simulation results are validated by particle image velocimetry (PIV) measurements. The main goal of the study is, on one hand, the validation of the numerical procedure proposed, and on the other hand, the detailed analysis of the unsteady inner flow field distribution and pressure fluctuation in the centrifugal pump at SOC. In addition, the head of the pump at SOC is predicted based on CFD results. The flow analysis indicates that there exists two eddies in each impeller flow passage, and the velocity at the volute diffusion part is very low. The amplitudes of pressure fluctuation at ƒr (impeller rotation frequency) and 3ƒr dominate in the impeller, while the pressure fluctuation at ƒb (blade passing frequency) is dominant in the volute.
Źródło:: Journal of Theoretical and Applied Mechanics; 2013, 51, 3; 649-660
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 12.

Tytuł:: Interaction between edge dislocation and inhomogeneity of an arbitrary shape and properties under coupled thermomechanical strains
Autorzy:: Sun, Yang
Li, Ang
Shi, Lan
Liu, Mabao
Powiązania:: https://bibliotekanauki.pl/articles/1839691.pdf
Data publikacji:: 2021
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: thermomechanical strain
edge dislocation
inhomogeneity
Opis:: In this work, a general approximate solution for the configurational force between edge dislocation and inhomogeneity of an arbitrary shape and properties with coupled thermo- mechanical loads was developed on the basis of the Eshelby equivalent inclusion theory. The effect of temperature-dependent elastic properties, thermal expansion coefficient and yield strength on the configurational forces was analyzed. Furthermore, the configurational force considered to be the driving force for dislocation migration was innovatively used to investigate the interaction mechanism between graphene and internal defects of a metal.
Źródło:: Journal of Theoretical and Applied Mechanics; 2021, 59, 1; 121-133
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 13.

Tytuł:: A fully-coupled three-dimensional fluid-structure interaction study on the externally-pressurized collapsible tube and the internal flow
Autorzy:: Zhang, Sen
Liu, HaoFei
Powiązania:: https://bibliotekanauki.pl/articles/2200900.pdf
Data publikacji:: 2023
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: fluid structure interaction
stability
eigenvalue problem
bifurcation
Opis:: We study the behavior of a collapsible tube conveying a fluid subject to external pressure that could occur in many physiological applications. The method of rotating spines is developed to enable an automatic mesh adaptation when the tube is deformed largely. We examine bifurcation diagrams when the tube is collapsed under a pressure driven condition and reveal that multiple solutions exist for a range of the Reynolds number. The stability characteristic of the system is discovered by determining stability of these solutions by the eigenvalue method for the first time, which is validated by solving a time-dependent problem of the system.
Źródło:: Journal of Theoretical and Applied Mechanics; 2023, 61, 2; 395--406
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 14.

Tytuł:: Numerical study of stall inception in a transonic axial compressor rotor based on the throttle model
Autorzy:: Zhu, X.
Liu, B.
Hu, J.
Shen, X.
Powiązania:: https://bibliotekanauki.pl/articles/280516.pdf
Data publikacji:: 2015
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: stall
axial compressor
throttle
tip clearance flow
Opis:: The goal of the current paper is to investigate inner flow behavior on stall inception in a transonic compressor rotor. The stall inception process is numerically carried out by unsteady 3-D simulations based on the throttle model. The current study shows that stall starts from the tip of the blade, and stall cell extends to the axial, circumferential and radial directions. Through the comparison of flow transition characteristics at different flow rate conditions, the interface between the incoming flow and tip clearance flow shifts forward to the upstream as the mass flow decreases. Eventually, the shock detaches from the blade leading edge, and tip clearance flow spills into the adjacent blade passage, thus stall happens in the affected blade passages.
Źródło:: Journal of Theoretical and Applied Mechanics; 2015, 53, 2; 307-316
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 15.

Tytuł:: Stability analysis of semi-active inerter-spring-damper suspensions based on time-delay
Autorzy:: Liu, Changning
Chen, Long
Zhang, Xiaoliang
Yang, Xiaofeng
Powiązania:: https://bibliotekanauki.pl/articles/2055032.pdf
Data publikacji:: 2020
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Tematy:: semi-active suspension
time-delay
controllable inerter
stability
ride comfort
Opis:: To analyze the variation rule of the critical instability time-delay of the semi-active ISD suspension, a general solution was proposed and applied into two three-element-structure ISD suspensions. The dynamical response and the performance of the semi-active ISD suspension in various time-delays indicated that different structures had different suspension performance. The time-delay deteriorated the performance of all of the suspensions which were analyzed. The stability of the semi-active ISD suspension would seriously weaken with the critical time-delay. This paper provided a general solution for parameters selection in semi-active ISD suspension design to avoid the negative effect of the time-delay.
Źródło:: Journal of Theoretical and Applied Mechanics; 2020, 58, 3; 599--610
1429-2955
Pojawia się w:: Journal of Theoretical and Applied Mechanics
Dostawca treści:: Biblioteka Nauki

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